I have been running Apple Mail for years (too many to count) and I have never had a situation where messages won't un-flag. But currently I have about 12 messages that are stuck in "Flagged" state. They reside in various folders in Mail, but they always show up in the Flagged folder. I have tried flagging them with different flag color and unflagging them but after about a second or two they the number in the flagged folder bounces back up. When I select them and "clear flag" no flag appears on them but they stay in the flagged folder.
Any clues on how to permanently remove the flag from these message?